ES2356215B1 - DEVICE AND PROCEDURE TO ESTABLISH CALL SWITCHING CONNECTIONS FOR REAL-TIME SERVICES IN LARGE AREA MOBILE NETWORKS. - Google Patents

Abstract

Device and procedure for establishing call switching connections for real-time services in wide area mobile networks. # A device for establishing call switching connections for delivering real-time service calls over a wide area mobile network is described, comprising: # - at least one physical interface for communication with an analog terminal equipment (TE) that generates incoming calls from services in real time; # - an adaptation interface to activate commands to establish at least one radio access carrier with a total bit rate of 128 Kbps, for example, a dual carrier of 64 Kbps. The adaptation interface can be external to the device (1) and used to connect to a user equipment (UE) of the mobile network , or an internal interface of the device (1?) constituting a 3G UE that implements the procedure to establish these connections in mobile networks for service s in real time. # The procedure comprises: receiving a call from a real-time service from the terminal equipment (TE) and activating commands containing carrier capacity information that provides call switching connections with 128 Kbps.

Description

Device and procedure for establishing call switching connections for real-time services in wide-area mobile networks.

Technical Field of the Invention

The present invention relates to a method and device for establishing call switching (CS) connections of 64/128 Kbps for real-time data or voice transmission, through a third generation network ( 3G) or post-3G technology (from English, beyond 3G), to provide real-time services such as voice, fax service, video over CS, etc.

Background of the invention

In the context of the latest strategies followed by 3G network operators, a tendency is to offer and transport all existing fixed services (supported by PSTN) also over the mobile network. This receives a great demand from the business segment of clients, for example in the SOHO market (small office / home office, of the English Single Office / Home Office).

One of these types of service that are crucial in any business portfolio is the fax service. Generally, client companies with high fax traffic can use a fax server that works on a server computer equipped with one or more fax-capable modems, which support the fax transmission protocol

T.30 and are linked to the PSTN (Public Switched Telephone Network), usually via landline telephone lines. More recently, the fax service can be equipped with T.38 technology ("Fax over IP") to transmit the signal over an IP network.

The fax service, the Old Ordinary Telephone Service (POTS) or point-of-sale terminals (POS terminals, of Point of Sale English) are computerized devices equipped with analog modems for transactions through a debit / credit card) are widely used on fixed lines applying different protocols (T.30, T.38 or G.711, etc.).

In order to support these services in real time (fax, POTS, POS, etc.), the Basic Access Interface (BRI) is used, Basic Rate Interface, 2B + D, 2B1D. The BRI is defined in the physical layer standard I.430 produced by the ITU as a con fi guration of integrated services digital network (ISDN) consisting of two “carrier” channels of 64 Kbps (B channels) for user or voice data and a "delta" channel of 16 kbit / s (D-channel) for any combination of data, control / signaling and interconnection of X.25 packet networks. The two B channels could be linked together providing a total data transmission rate of 128 Kbps.

In 3G networks (and later than 3G), different domains are established depending on the transfer mode for traffic transmission of the different services: the call or circuit switching mode (CS) and packet switching mode (PS) Packet Switching). In addition, several kinds of traffic are distinguished according to the type of service. A radio access bearer (RAB) with a certain capacity defined by a series of attributes is assigned to each service. The 3GPP in technical specification TS 34.108 gives some standard examples for linking radio bearers to services and are shown in table 1 below.

TABLE 1

Note that the traffic of a service such as FAX is classified as continuous fl ow and is assigned to radio access bearers with a bit rate lower than 128 Kbps of BRI.

Therefore, it is desirable that mobile network operators (MNOs) offer all customer segments (especially SOHO) fax service or other real-time services in all situations where MNOs They provide total communications service (that is, ensure data connectivity, rapid activation, protected service, etc.) using their wide-area mobile networks to provide such services, rather than existing landlines.

Description of the invention

The present invention allows real-time fax transmission (in digital formats of group 3 and 4 faxes) and any other real-time service (data transmission in real-time transactions, for example, executed by POS services; switching video on call; voice, etc.) transparently use up to two 64 Kbps carriers provided by the mobile network in the call switching domain (CS). These two 64 Kbps CS connections emulate an ISDN BRI (2 channels of 64 K) and allow real-time operation as in the landline.

The present invention preferably uses the radio access carrier (RAB) of 64 Kbps uplink (UL) and 64 Kbps downlink (DL), associated by the TS

34,108 of 3GPP with conversational class traffic such as video calling, to carry fax traffic and other real-time traffic mentioned above. The 64/64 conversational is currently supported by all 3G networks (access and central). Other RABs defined in 3GPP TS 34.108 to provide a transmission rate of 128 Kbps in the CS domain can also be used for this purpose (see table 1).

The present invention establishes the physical interface between the originating or calling terminal (a G3 or G4 fax machine, an old ordinary telephone, a POS device, etc.) and a device that supports this physical interface and establishes the necessary protocol conversions. to carry out the fax transmission or any other real-time service on the carrier (s) CS.

Communication between the device that converts the interface and the originating terminal (a terminal device: TE, from English Terminal Equipment) can be done through standard AT commands, normally used by computers to communicate with modems, defined in the 3GPP technical specification 27.007. The AT commands are exchanged between a terminal adapter (TA), which is the physical equipment in which the AT command interpreter resides (for example, the user's mobile phone) and the terminal equipment (TE), which is the physical equipment from which applications communicate with TA using AT commands (for example, a computer, a digital fax machine, ...). (Command) AT means ATTENTION; This two-character abbreviation is always used to initiate a command line to be sent from TE to TA.

One aspect of the invention refers to a device for establishing CS connections to provide real-time services in wide-area mobile networks (which support 3G or beyond 3G technologies), capable of connecting to at least one TE capable of originating a Real-time transmission (fax, voice, video, etc.). Said device comprises:

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at least one physical interface for communicating with the originating terminal equipment (fax, POT, etc.) converting analogue source signals into digital format, for example, through FXS telephone interface ports (remote control station, of the English Foreign eXchange), USB ports (universal serial bus, Universal Serial Bus), etc.

-

an adaptation interface to activate the appropriate commands during the call establishment period in order to establish the CS connection (s) that provides radio access bearer (s) with a bit rate 128 Kbps. Preferably, AT commands are exchanged through the adaptation interface between the device and a user equipment (UE), which retransmits the call (for example, a 3G phone) from the terminal equipment (TE) connected to the physical interface. According to different possible embodiments of the invention, the adaptation interface can be either an internal interface (which uses either standard AT commands or specific proprietary commands) if the invention is implemented as an adapter device integrated in a 3G UE or a External interface in a separate module implementation to connect to an existing 3G UE (for example, the user's mobile phone).

Another aspect of the invention relates to a method for establishing connections in the CS domain of mobile networks to provide real-time services (voice, fax, video over CS, ...), which comprises the following steps:

-

receive a call establishment request from at least one TE (fax machine, POS device, landline, mobile phone, etc.) that can send (/ receive) calls from a real-time service;

-

activate a series of commands (for example, from the basic AT command set) to establish at least one call switching connection; The commands are generated by a device connected to the TE and at least one of these commands contains radio access bearer capability information that includes a RAB bit rate of 128 Kbps (for example, 2x64 Kbps).

In the preferred case that AT commands are activated to establish the CS carriers, the particular parameters and commands to be used are AT + CBST and AT + D, according to the following command parameter syntax

AT + CBST parameter command syntax

The AT + CBST command is used to select the carrier service <name> with data rate <speed> and the connection element <ec> to be used when data calls originate (see 3GPP TS 22.002).

To establish the call, the AT + D command is used, as defined by ITU-T V.250 (dialing order D). The D.250 dialing order lists characters that can be used in a dialing chain to make a call or control supplementary services according to 3GPP TS 22.030. Its use in GSM / UMTS is listed in this subclause and new dial modifiers applicable only to GSM / UMTS are introduced. For a device that supports only AT commands, it is mandatory to support the control of supplementary services according to 3GPP TS 22.030 through the dialing order or through specific supplementary services commands (+ CCFC, + CLCK, etc.), where 3GPP TS 22,030 identifies the supplementary services as mandatory.

The carrier capacity information included in the triggered or triggered commands also contains the information transfer capability, which is defined in ISDN with one of two possible valid values: UDI or RDI. UDI means unrestricted digital information (also known as 64U or 64C (“clear 64”), meaning the term “clear” that the 64 Kbps channel carries traffic transparently or clearly; the transfer rate of Call traffic information is set to 64 Kbps). RDI means restricted digital information (also called Restricted Digital Information), also called 64R (“64 restricted”). In the context of the invention, the information transfer capacity is adjusted to the information transfer capacity (UDI).

In this case where it is required to establish 128 Kbps (2x64 Kbps), respective commands are sent with the same carrier capacity information from the originating and finalizing parts (fixed or mobile equipment), so that a carrier can be established 64 Kbps double transparent on the mobile network.

The core network (CN) attempts to complete calls using carrier capacity information, in addition to the information provided by the mobile network operator (MNO). Since the UDI is requested for call establishment, the CN routes the call on facilities that the MNO designates as facilities that support UDI.

The 64/64 conversational UDI is supported by the access network and the central network, and is a transparent carrier for carrying traffic, so that it can be used well to transparently transport, for example, the fax transmission protocol (T.30) for group 3 and 4 between the originating and finalizing fax machine. The 3G mobile network interconnects the two fax machines through the normal PSTN gateways used to connect a mobile network and a landline.

A major advantage of the present invention is a significant saving of bandwidth (approximately 300 Kbps per connection) in the radio interface, since all overloads introduced when using IP are eliminated.

Description of the drawings

To complete the description that is being made and in order to facilitate a better understanding of the characteristics of the invention, according to a preferred example of practical realization thereof, a set of drawings accompanies said description as an integral part thereof, in which, by way of illustration and not restrictively, the following has been represented:

Figure 1 - Shows two different embodiments of the invention: (A) a device for establishing call switching connections for real-time services connected to a 3G user equipment, (B) a device for establishing call switching connections for services in real time integrated into a single 3G user equipment.

Figure 2. - Shows a message diagram representation of the procedure for establishing call switching connections for real-time services implemented by the device shown in Figure 1 (A), according to a preferred embodiment of the invention.

Detailed description of the invention

Figure 1 shows a device (1, 1 ') for establishing CS connections in 3G networks for calls from a real-time service, for example, fax, generated from a terminal equipment (TE) to which the device (1) can be connected , one'). In Figure 1 (A), according to a possible embodiment of the invention, the device (1) is also connected to a 3G user equipment (UE), for example, a 3G mobile phone, so that this device (1) It acts as an external POTS line adapter for services such as voice, fax or others to be carried in real time by switching calls. Another possible embodiment of the invention refers to a single device (1 ’) as shown in Figure 1 (B) which has the POTS line adapter integrated in a 3G user equipment.

Figure 2 shows the exchange of messages between the device (1) and the user equipment (UE) at the originating or calling party. When the device (1) receives a call establishment request message (20) from the terminal equipment (TE) to which it is connected, the device (1) activates an AT command (21) containing the information of the carrier of the radio access required, that is, the 64 Kbps CS channel. The carrier capacity is entered in a SETUP message (22) when the mobile user equipment (UE) wants to establish a call. In the case of a mobile termination call, the MSC / HLR in the central network (CN) sends the SETUP message with the carrier capacity information. This is used to define the type of call to be established: telephony, data, video, etc.

The carrier capacity information element has, among many other parameters, the following options for CS calls, as defined in 3GPP TS 22.001:

When there is a FAX call from a mobile user equipment (UE) to a fixed FAX in the PSTN, it is necessary to set the 64K CS carrier on the mobile side. Thus, the carrier capacity has the ability to transfer information adjusted to unrestricted digital information. Then, in the central network (CN), it is necessary to intercept and modify this message to 3.1 kHz audio to convert the call to reach the external FAX in the PSTN. The signaling nature of the call is then changed to allow appropriate end-to-end signaling interworking. This behavior is achieved for subscribers who use a compatible line by means of intelligent network triggers in both the origin and end of the calls parts.

When there is a FAX call from PSTN to a user equipment (UE) in the mobile network, the call comes with a 3.1 kHz audio capability and the central network (CN) requires modifying this message to unrestricted digital information with establishment of 64 Kbps and perform data conversion.

Once the transparent 64K CS carrier is established in uplink as well as in downlink, the device (1) sends a proprietary message (23) to indicate derivation of data on the 64K channel. The call is established normally ( 24). Then, the device (1) receives a call establishment con fi rmation and the real-time service data is retransmitted (25) by the device (1) to the mobile network through the mobile user equipment (UE), which performs said transmission using the 64 K radio carrier previously negotiated with the central network (CN).

Note that in this text, the term "comprises" and its derivations (such as "understanding", etc.) should not be understood in an exclusive sense, that is, these terms should not be construed as excluding the possibility that what is described and defined may include other elements, stages, etc.

Claims (12)

1. Device (1, 1 ’) to establish call switching connections for real-time services in wide-area mobile networks, characterized in that it comprises:

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at least one physical interface that connects and communicates the device (1, 1 ’) with an analog terminal equipment (TE) capable of generating an incoming call from a real-time service;

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an adaptation interface that sends device commands (1, 1 ’) to request and establish at least one radio access bearer to carry the incoming call in call switching mode with a total bit rate of 128 Kbps.

2.

Device (1) according to claim 1, characterized in that the adaptation interface is connected to a user equipment (UE) of the wide area mobile network.

3.

Device according to any preceding claim, characterized in that the adaptation interface sends at least one AT command to request a radio access bearer when the incoming call is received through the physical interface and to translate the AT command into a message comprising information of radio access carrier capacity that contains unrestricted digital information and a transfer rate set at 64 Kbps for uplink and downlink.

Four.

Device according to any preceding claim, characterized in that the adaptation interface sends at least one AT command to request the at least one radio access carrier.

5.

Device according to any preceding claim, characterized in that the physical interface is selected between USB and FXS.

6.

Device according to any preceding claim, characterized in that the physical interface is connected to the analog terminal equipment (TE), which is selected between an analog modem or a fax terminal.

7.

Device according to claim 6, characterized in that the adaptation interface sends at least one AT command to request a radio access bearer with a transfer rate set at 64 Kbps for uplink and downlink when a fax call is received and delivered the fax content on the radio access carrier.

8.

Procedure for establishing call switching connections for real-time services in wide-area mobile networks, comprising:

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receive a call establishment request for a real-time service from a terminal equipment (TE);

characterized in that it also includes:

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activate commands to establish at least one call switching connection when the call establishment request is received, the commands being generated by means of a device (1, 1 ') connected to the terminal equipment (TE) and comprising access bearer capacity information radio of at least one radio access carrier that provides a total bit rate of 128 Kbps.

9.

Method according to claim 8, characterized in that the call is established and routed as unrestricted digital information to be carried on a double carrier of 64 Kbps radio access.

10.

Method according to any of claims 8 to 9, characterized in that the call is a fax call or a call from an analog modem.

eleven.

Method according to any of claims 8 to 10, characterized in that the commands are AT commands.

SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 200930190 SPAIN Date of submission of the application: 05.20.2009 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: H04M11 / 06 (2006.01) H04W88 / 04 (2009.01) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

X

WO 9405114 A1 (NOKIA TELECOMMUNICATIONS OY et al.) 03.03.1994, summary; Figures 1,4,5. 1,2,4-8,10,11

Y

3.9

Y

&quot; 3rd Generation Partnership Project; Technical Specification Group Core Network; Circuit switched 3.9

data bearer services (Release 6) (3GPP TS 23.202 version 6.1.0 Release 6); 3rd Generation

Partnership Project (3GPP), Mobile Competence Center; 650, route des Lucioles;

F-06921 Sophia-Antipolis Cedex; France 03.31.2005. Heading 5.1.

TO

WO 9222976 A1 (TELENOKIA OY) 23.12.1992, summary; page 7, line 28 -page 11, 1-11

line 21; figure 3.

TO

US 6011968 A (PATEL SATYA A et al.) 04.01.2000, the whole document. 1-11

TO

US 2005014532 A1 (IMMENDORF CHAZ et al.) 20.01.2005, figures 8-9; paragraphs [0038-0045]. 1-11

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 17.03.2011

Examiner M. Rivas Sáiz Page 1/4

REPORT OF THE STATE OF THE TECHNIQUE Application number: 200930190 Minimum documentation sought (classification system followed by classification symbols) H04M, H04W Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENES, EPODOC, WIPI State of the Art Report Page 2/4  WRITTEN OPINION Application number: 200930190 Date of Completion of Written Opinion: 03.17.2011 Statement

Novelty (Art. 6.1 LP 11/1986)

Claims Claims 2-11 1 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims Claims 2-11 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 3/4  WRITTEN OPINION Application number: 200930190 1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

WO 9405114 A1 (NOKIA TELECOMMUNICATIONS OY et al.) 03.03.1994

D02

&quot; 3rd Generation Partnership Project; Technical Specification Group Core Network; Circuit switched data bearer services (Release 6) (3GPP TS 23.202 version 6.1.0 Release 6); 3rd Generation Partnership Project (3GPP), Mobile Competence Center; 650, route des Lucioles; F-06921 Sophia-Antipolis Cedex; France 03.31.2005. Heading 5.1. 03.31.2005

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement Document D01 is considered the closest in the state of the art to the requested invention. With regard to claim 1, D01 describes a device (Figure 4 reference 37) suitable for establishing call switching connections for real-time services in wide-area mobile networks characterized in that it comprises at least one physical interface (Figure 4 reference 47) which connects and communicates the device with a terminal equipment (figure 4 reference 31 and 53) capable of generating an incoming call from a real-time service (page 2 line 13 to 15). an adaptation interface (page 6 line 19 to 20) that sends device commands to request and establish at least one radio access bearer to carry the incoming call in call switching mode with a total bit rate of 128 Kbps (page 4 lines 30 to 35 and page 5 lines 12 to 17). Therefore claim 1 is not new (Article 6 LP.). In relation to claim 2, D01 describes a user equipment to which the adaptation interface is connected. In D01 the user equipment is a 2G device. The claim indicates that it is a user equipment of the wide area mobile network (3G or later). Replacing the equipment of the GSM network with another of the 3G network is considered to be a design alternative. Therefore claim 2 does not meet the requirement of inventive activity (Article 8 LP.). Claim 3 uses AT commands to select a carrier. Document D01 describes the use of AT commands to establish communication but does not indicate that a radio access provider containing unrestricted digital information (UDI) is selected. The selection of this type of carrier is among the possible ones according to document D02. This document describes the different carrier capabilities for data services for UMTS in circuit switching. The mere selection of one of these carriers does not endow the claim of inventive activity. One skilled in the art would combine the device described in D01 with the features mentioned in D02 to obtain claim 3. Therefore claim 3 does not meet the requirement of inventive activity (Article 8 LP.). Claim 4 uses an AT command to request the radio bearer, therefore in view of the aforementioned it is concluded that claim 4 does not imply inventive activity (Article 8 LP.). The USB and FXS interfaces detailed in claim 5 are the common and widely used interfaces for equipment connection. Therefore, the use of said interfaces does not provide the invention with inventive activity (Article 8 LP.). Claims 6 and 7 correspond to fax applications as indicated by D01 and therefore do not imply inventive activity (Article 8 LP.). Claims 8 to 11 correspond to the procedure performed by the previous device to fulfill its function. They define the same technical characteristics as those indicated in the device claims. Since the device claims do not imply inventive activity (Article 8 LP.), The procedure set forth in the same terms either. It is concluded that claims 8 to 11 do not meet the requirement of inventive activity (Article 8 LP.). State of the Art Report Page 4/4